(*****************************************************************************

  Liquidsoap, a programmable stream generator.
  Copyright 2003-2024 Savonet team

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details, fully stated in the COPYING
  file at the root of the liquidsoap distribution.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA

 *****************************************************************************)

let ref =
  let a = Lang.univ_t () in
  Lang.add_builtin "ref" ~category:`Programming
    ~descr:"Create a reference, i.e. a value which can be modified."
    [("", a, None, None)]
    (Lang.ref_t a)
    (fun p ->
      let x = List.assoc "" p |> Atomic.make in
      let get () = Atomic.get x in
      let set v = Atomic.set x v in
      Lang.reference get set)
